A man in his 30s has had part of his ear bitten off in a bar on Amelia Street in Belfast city centre.
It happened at about 23:50 BST on Sunday after a fight began on the dance floor.
The suspect is believed to have left in a taxi outside James Street South. He was with a female at the time.
He is described as being 5ft 7in (173cm) tall with short dark hair and a tattoo on his neck.
Police are appealing for anyone with information to come forward.